urine output after spinal for total knee replacement

Good job for addressing the issue!

Just a reminder that there's nothing magical about 30ml/hr - minimum urine output per hour is weight based: 0.5ml/kg/hr, which works out as 30ml/hr in an 'average', 60k adult. If they're bigger then 30ml/hr is technically oliguria; smaller, and 20ml/hr could be in the dry-not-okay range. Obviously not the case here, but something to keep in mind